Picture projection screen



June 4, 1940.

D. M, KENNEDY PICTURE PROJECTION SCREEN Filed Jan. 23, 1939 A \rllfffl/flllll INVENTOR fieW cymffen-lze qiy ATTORNEYS Patented June 4,1940

UNITED STATES PATENT OFFICE rrc'ruar. raomc'non scarier: Dewey M. Kennedy, Rochester, N. Y. Application January 2:, isaa'semi No. 252,320

2 Claims.- (01. 88-24) This invention relates to screens for receiving cinematographic, stereoscopic and other light projected pictures and has particular reference to an improved screen of the said character which is so constructed and arranged as to display the picture in relief thereby giving the impression of depth and simulating true three dimensional proportions.

The invention has in view a screen having a reflecting surface provided with offset, closely spaced, relatively small light diffusing areas which angularly reflect and disperse the light from points offset with reference to the body of the screen so that the reflected light from the offset areas displays the picture in relief giving the impression of depth.

The invention more particularly comprehends a screen including a flexible panel provided with closely spaced relatively small perforations substantially uniformly distributed thereover, with a flexible fabric backing bonded to the back of the panel by a pliable adhesive layer and with a metallic coating covering the opposite surfaces of the screen and the adhesive layer at the bottom of the perforations in which perforations the opaque coating is recessed from the front surface of the flexible panel to provide oflset light diffusing areas.

With these and other objects in view, reference is now made to the following specification and accompanying drawing in which there is illustrated the preferred embodiments of the invention, while the appended claims cover varia-,

tions and modifications thereof which fall within the scope of the invention.

In the drawing:

Fig. l is an enlarged fragmentary face view of Referring to the drawing by characters of reference, the screen includes a flexible transparent panel I I having a plane forward surface I 2 play the picture in relief with the impression of depth.

In the embodiment illustrated, the offset areas H are formed by providing the flexible panel II with closely spaced relatively small perforations and applying a coating H to oppositesurfaces thereof so as to close the perforations with films of said coating, the forward faces of which are recessed from the surface of the panel.

The flexible panel ll may be provided with a backing such as a flexible fabric backing ii of cotton, linen or other suitable flexible material which is bonded to the panel II by a flexible adhesive l6 and with the coating l4 covering both faces of the panel II and the adhesive l6 at the bottom of the perforations. The adhesive l6 extends into the perforations in, the panel II and provides a bond uniting the coating l 4 in the perforations with the backing IS.

The flexible panel ll preferably consists of a thin sheet of Celluloid which retains its original flexibility over a long period of time so that the panel and its backing may be rolled to a compact form when not in use. The flexible adhesive l6 preferably includes a cellulose acetate body or other cellulose .ester, a solvent therefor and a softening agent, such as castor oil, which prevents undue hardening of the adhesive, while the coating l4 preferably consists of a metallic paint such as powdered aluminumor bronze in suspension in banana oil or amyl acetate.

In practice, it has been found that excellent results are obtained with the offset areas l3 being of circular formation, approximately of an inch in diameter and spaced apart approximately of an inch. These dimensions, however, may be varied as ofiset areas of of an inch in diameter will produce the desired results.

The solvent in the coating It acts upon the surface of the Celluloid panel II to render the same tacky so that the metallic paint becomes embedded in and intimately bonded to the surface thereof. The amyl acetate in the adhesive l6 likewise renders the adhesive miscible with the coating I 4 and the rear surface of the Celluloid to provide a homogeneous structure.

.The backing l5, together with the adhesive l6 and the coating It on the rear surface 'of the panel H, forms'an opaque reflecting medium at the rear of the panel, the coating It on the front surface of the panel being of such a nature as to partially reflect the light rays projected thereupon while such rays as pass therethrough will be reflected by the medium at the rear of the panel.

' reflecting and partially transmitting the light rays which fall thereon, a flexible fabric backing, and-a flexible adhesive including a cellulose ester covering the forward face of the backing and the 'metallic coating on the rear of the panel and extending into the recesses in the rear of the panel defined by the coating in the said perforations and providing a bond uniting the coatin'gon the back of the panel and in the perforations with the backing.

2. In a screen of the character described, a Celluloid panel having relatively small closely spaced perforations extending therethrough, a light reflectingmetallic coating overlying the forward and rear surfaces of said panel and closing the perforations therein with films of said coating which define offset areas recessed from the forward surface of the panel, said coating on the forward surface of said panel partially reflecting and partially transmitting the light rays which fall thereon, a flexible fabric backing and a flexible adhesive covering the forward face of the backing and the metallic coating on the rear of the panel and providing a bond uniting the coating on the rear of the panel and the films in the perforations with the backing.

DEWEY M. KENNEDY. 

